About Hydrogen

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Q - 1)   Define Hydrogen and write down uses, physical?
Hydrogen: 

Hydrogen

           A colorless, highly flammable gaseous element, the lightest of all gases and the most abundant element in the universe, used in the production of synthetic ammonia and methanol, in petroleum refining, in the hydrogenation of organic materials, as a reducing atmosphere, in ox hydrogen torches, and in rocket fuels. Atomic number 1; atomic weight 1.00794; melting point -259.14°C; boiling point -252.8 °C; density at 0 °C 0.08987 gram per litter; valence 1.

Physical Properties of Hydrogen:

1.    It is a colorless, odorless and tasteless gas.
2.    It is insoluble in water and highly inflammable gas and burns with blue flame.
3.    Its bond dissociation energy is 104 k. cals/mol and ionization energy is 13.54 eV.
4.    It liquefies at -252 °C and freezes at -259 °C.
5.    Electro negativity of hydrogen is 2.1.

Uses of Hydrogen:
  1.  It is used in manufacture of fertilizers.
  2. It is used in manufacture of tungsten bold filaments and vegetable ghee.
  3.  It is used for purification of metals.
  4. It is used in the preparation of oxy-hydrogen flame, which is used in welding due to production of high temperature.
  5. It is used in the preparation of chemicals like NH2, CH3OH, etc. 

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